Can you find a different place for you child? It can be hard to leave your child in daycare as it is, worse if you know their practices are not in accordance with your wishes. They seem very inflexible... (don't mean to sound critical of you, it's just this is something that would worry me is all )

You might find some of the advice in Elizabeth Pantley's No Cry Sleep Solution helpful - it's very practical but with no controlled crying advice. Try not to put too much pressure on yourself and your DS - some kids really just take a long time to get there, you know? DS is only just now getting the hang of it - believe me, we tried all sorts of things but he just needed that parenting to sleep for a long time.

All the best~~